The Hammer's Forge (Revision 1160)

After completing the Tears of the Mountain quest at the Drenchfort, you may get this quest - The Hammer's Forge - by talking to Alya about her brother's 'friend'. She explains that he used to have a friend that turns out to be a legendary hammer known as Splinter's Bone. Unfortunately, this is not a useable item in the game though, once returned, Alya will sell a higher quality of goods.

Once you've acquired the quest, teleport out to the Fjord, turn around, and follow the road until you find the narrow path on your left or east on the map. This will take you to the start of the dungeon. Upon entering, you will notice a chest on a raised platform in the center of the room. That is your final goal.

Go through the door on the left and proceed through the dungeon. There is a variety platforming and combat challenges through the next couple of rooms but nothing too dangerous.

Most importantly, always check undewater. There are a number of collectables and hidden chests found in underwater caverns. If you can't solve a puzzle, more than likely, the answer is underwater.

Also, there is a legendary pair of armblades hidden behind some corruption crystals in the dungeon. After you wall run to a section where you have use a shadow bomb to blow up some cystals for the main path, make sure you throw an extra shadow bomb towards where you came from. They are inert so you will be able to go and pick it up again. Drop down to the area where you would have fallen if you failed the wallrun, toss the bomb at the crystals, and claim the useful, low-level weapon, the Omega Blades.

Then continue through the dungeon, grab the hammer, return it to Alya and you will have completed the Hammer's Forge mission.